JPH08258814A - Bottom sealer in packaging machine - Google Patents

Abstract

PURPOSE: To obtain a bottom sealer capable of controlling an air amount in a bag and correctly packaging an article in a packaging machine without a positional shift if an article to packaged is unstable. CONSTITUTION: In a tubular film 5 surrounding an article fed at a fixed interval along a feed path for an article 1, an upper mold 10 and a lower mold 11 for conducting a bottom sealing on a part of a film between articles are disposed so as to move close to each other. A presser plate 72 for pressing a front side of an article 1 is provided frontward of the upper mold 10. A second presser plate 75 for pressing a rear side of a succeeding article 1 is provided rearward of the upper mold 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bottom sealer in a packaging machine, and more particularly to a tubular film surrounding a cylindrical article fed at regular intervals along a feeding path of the article, wherein The present invention relates to a bottom sealer in a packaging machine that suppresses the movement of articles during bottom sealing and controls the air in the bag.

[0002]

2. Description of the Related Art In the above bottom sealer, FIG.
As shown, the articles 1,
12 are sent at regular intervals, and the film 5 in the portion between the articles 1, 1 ... Is pressed from above and below by the upper mold 10 and the lower mold 11, and the films shown in FIG. It is bonded as shown in. Considering the state of the air at the time of FIG. 12B, the film 5 is crushed more flatly than the tubular shape.
A place for the internal air is needed. As a result,
There is air going to the A portion in the rear of the article 1 and the B portion in the front of the article 1. There is no problem because the A part is open backwards, but B
The air in the part has a limit because it is a limited size bag.

[0003]

As a result, in the case of an unstable article due to internal pressure applied to the bag, it is attempted to move the article to cause a positional deviation or peel off the seal portions c and d of the film. To do. The seal portion d is in a state where the inner surface poly is also solidifying, but the seal portion c is still in a melted state and is easily peeled off. In order to eliminate this drawback, the present invention pushes the front part B of the bag from the outside to reduce air,
On the other hand, the rear side holds down the rear side of the succeeding article.

[0004]

According to the present invention, in a tubular film 5 enclosing an article fed at a constant interval along a feed passage of the article 1, an upper mold 10 for bottom-sealing a film in a portion between the articles is provided. The lower mold 11 is provided so as to approach, and a pressing plate 72 for pressing the front side of the article 1 is provided in front of the upper mold 10. A second pressing plate 75 for pressing the rear side of the succeeding article 1 is provided behind the upper mold 10.

[0005]

When the film 5 is sealed between the upper mold 10 and the lower mold 11, the pressing plate 72 presses the front side of the article 1 and the B in front of the bag is pressed.
By pressing the part, the amount of air in the bag can be reduced, and the amount of air in the bag can be adjusted. In addition, the pressing plate 75 presses the rear side of the article 1 that follows, so that even an unstable packaged article 1 is displaced. Never.

[0006]

EXAMPLE As shown in FIG. 4, the cylindrical articles 1, 1 ... Are sent to the front, that is, the right side in FIG. It is fed into a film 5 which is rolled into a tubular shape, and both ends of this film 5 are sandwiched by fin sealers 7 and 7 and continuously sealed, and the upper and lower feed conveyors 8 and
The sheet is sandwiched by 8 and sent, and then the upper and lower molds 10 and 11 for bottom sealing are subjected to seal cutting and sent to the discharge conveyor 12. Reference numeral 13 is a heater for the upper mold 10 and lower mold 11, and 14 is a comb conveyor for feeding the article 1 at the upper mold 10 and lower mold 11.

The upper mold 10, along the feeding path of the article 1,
A pair of upper links 20, 2 are provided on both front and rear sides of the lower mold 11.
0; 21, 21 and lower links 22, 22; 23, 23 are provided so as to be synchronously rotated by a motor 19, and upper and lower supports 2 are provided at the ends of these links 20, 21, 22, 23.
The front and rear ends of 4, 25 are supported so as to rotate, and the shafts 28, 29 are attached to the central tubes 26, 27 of the upper and lower supports 24, 25.
Are fitted so as to move up and down, and the upper die 10 and the lower die 11 are fixed to the lower and upper ends of these shafts 28 and 29, respectively. Axis 2 above
A stopper nut 30 for adjusting the amount of deflection is screwed onto the parts 8 and 29.

As shown in FIGS. 6 and 7, the pins 32, 32 planted on both sides of the upper mold 10 are loosely fitted in the vertical grooves 33, 33 extending below the support 24 and are provided on both sides of the support 24. Compression springs 36, 36 are inserted between the adjusting screws 34, 34 and the recesses 35, 35 of the upper mold 10. As shown in FIGS. 6 and 7, the pressure bar 40 fixed to the upper end of the shaft 28 extends to both sides, and the cam followers 41, 41 made of bearings fixed to both ends of the pressure bar 40 are laterally fixed. It engages with the upper surfaces of the horizontal guide cams 42, 42.

Pressure cams 43, 43 are provided above the cam followers 41, 41. As shown in FIGS. 9 and 10, the pressure cams 43, 43 are supported by a hanging frame 45 and springs 44, 44. Repress downward. A cam 43 is attached to the side opposite to the horizontal guide cam 42 that translates the sealer in parallel, and pressure is applied by a pressure spring 44. In the figure, 47 is a height adjusting screw, and 46 is an adjusting screw of the pressurizing spring 44. As shown in FIGS. 7 and 8, a cylinder 52 is fixed to the pressure bar 40 via a pair of legs 50, 50 and a plate 51, and a piston 53 of the cylinder 52 has a frame 54 and a pair of downwardly extending knives. It is fixed to both ends of a knife 56 provided to move up and down in the groove 58 of the upper die 10 via the guide pins 55, 55. As shown in FIG. 8, the lower die 11 is provided with a groove 57 for receiving the knife 56.

As shown in FIG. 11, the lower mold 11 is substantially vertically symmetrical with the upper mold 10, and the corresponding parts are indicated by adding '. As shown in FIG. 5, the cam follower 61, which is symmetrical to the cam follower 41, engages with the horizontal guiding cam 62, which is symmetrical with the cam 42, and is supported by the fixed pressure receiving cam 63, which is symmetrical with the pressure cam 43. The receiving cam 63 is fixed, and the pressure cam 43 can be slid up and down by an adjusting screw 47 to adjust the height. Therefore, the space between the pressure cam 43 and the pressure receiving cam 63 is set to the cam follower 41 of the pressure bar 40 and the shaft 2.
Since it is determined by the dimensions of 8, 29, the upper mold 10 and the lower mold 11 of the sealer, the sealing pressure by the pressure spring 44 can be adjusted by adjusting the height of the pressure cam 43. As shown in FIGS. 1 and 2, vertical grooves 70, 70 that extend in the vertical direction are provided on both sides of the front portion of the support 24 that supports the upper mold 10.
Slide blocks 71, 71 fitted to move up and down inside
A push plate 72 for holding the front end (entry side) of the article 1 is fixed in between. As shown in FIGS. 1 and 3, the slide block 74 is also fitted in the vertical grooves 73, 73 on both sides of the rear portion of the support body 24 so as to move up and down, and between the slide blocks 74, 74 the following article 1 is inserted. A second pressing plate 75 for pressing the rear side (exit side) is fixed, and this pressing plate 75 is guided by a height guide bar 68 and a guide receiving bar 69 that receives it.

Next, the operation of this device will be described. The drive motor 19 causes the pair of upper links 20 and 21 to rotate counterclockwise in FIG. 4 and the pair of lower links 22 and 23 to rotate clockwise, and the upper and lower supports respectively supported by them. 24 and 25, shafts 28 and 29 supported by the central tubes 26 and 27, and upper and lower dies 10 and 11 also rotate in the same direction as the upper and lower links 20, 21, 22, and 23, respectively. Upper mold 1
In the state before 0 and the lower mold 11 are in contact with each other, the upper mold 10 projects downward due to the elastic force of the springs 36, 36, and the lower mold 11 has corresponding springs 36 ', 36' (see FIG. 11).
The stopper nuts 30 and 31 are in contact with the cylinders 26 and 27, respectively, and the upper die 10 and the lower die 11 are always in a vertical state and move in parallel along a circular locus.

Thus, as shown in FIG. 1, the upper die 10 and the lower die 1
When 1 is contacted at a position between the articles 1 and 1 of the film 5 which is rolled into a tubular shape from between the blind conveyor 14, the upper die 10 is connected to the spring 3 through the pressure bar 40 and the shaft 28 in FIG.
6 is actuated relatively upward against the resilience of the spring 6, and similarly, the lower die 11 is actuated relatively downward in contact with the resilience of the spring, and the upper die 10 and the lower die 11 sandwich the film 5 from each other. It will be sent horizontally in a straight line.

When the cam followers 41 on both sides of the pressure bar 40 hit the surface of the cam 42, the spring 36 causes the upper die 10 protruding by the amount of deflection to move linearly along the cam surface. That is, the links 20, 21, 22, 23
The sealer is linearly moved by bending a part of the circular movement of the cam 42, 62 by the cams 42 and 62. Also, the length of linear movement can be changed by changing the amount of this deflection. At this time, the drive motor 19 moves unequally so that the upper die 10 and the lower die 11 are fed at the same speed as the film 5. At this time, since two pairs of rotary links are used to drive the sealer such as the upper mold 10 and the lower mold 11, high-speed sealing can be performed, and since the sealer is vertically inserted between the articles, it is easy to fold the film. The air can be easily removed, and the length of the package to be packaged can be shortened.

On the other hand, at this time, the pressurizing cams 43, 43 are driven by the elastic force of the springs 44, 44 to cause the cam followers 41, 41 to move.
Is pressed downward, and this force presses the upper mold 10 downward via the pressure bar 40 and the shaft 28, and applies a welding pressure to the film 5. At this time, as shown in FIG. 1, the push plate 72 first presses the film 5 at the front end of the article 1, and the push plate 75 first lowers and presses the film 5 at the rear side of the succeeding article 1 by its own weight. . At this time, the article admission side push plate 75 of the bottom sealer is restricted in its lowering position by the height adjusting guide bar 68 and the guide receiving bar 69 so as not to bite into the tubular film 5 more than necessary. As described above, the push plates 72 and 75 after the article exit of the bottom sealer function to push the air in the bag to the sealer side together with the return of the packaged article 1 and prevent the article 1 from moving. .

When the film 5 is thus welded, the piston 53 of the cylinder 52 shown in FIG.
4. The knife 56 is operated downward via the knife guide pins 55, 55 to cut the welded film 5 and separate the individual articles 1, 1 ... .. are separated and sent to the discharge conveyor 12. After that, the upper mold 10 and the lower mold 11 are separated into upper and lower parts, respectively, protruded by the springs 36 and 36 ', and move in a circular locus. Thus, in the above apparatus, since the sealer is rotated by two pairs of links, high-speed sealing can be performed, and strong pressing can be performed by the pressure cam and the pressure spring, so that a strong seal can be achieved. .

[0016]

As described above, according to the present invention, when the film 5 is sealed between the upper mold 10 and the lower mold 11, the pressing plate 72 presses the front side of the article 1 and presses the B portion in front of the bag, thereby The amount of air in the bag can be reduced and the amount of air in the bag can be adjusted, and since the pressing plate 75 presses the rear side of the succeeding article 1, even an unstable packaged article 1 can be accurately positioned without causing displacement. An article can be packaged.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an upper die and a lower die according to an embodiment of the present invention.

FIG. 2 is a front view of the main part as seen from the direction A.

FIG. 3 is a rear view of the main part as seen from the B direction.

FIG. 4 is an explanatory diagram showing an outline of an apparatus to which the present invention is applied.

FIG. 5 is an enlarged view of a main part thereof.

FIG. 6 is an end view thereof.

FIG. 7 is an enlarged vertical sectional view of the upper mold portion.

FIG. 8A is an enlarged cross-sectional view of the upper and lower mold parts,
(B) is a perspective view of a part thereof.

FIG. 9 is an enlarged side view of the upper horizontal guide cam.

FIG. 10 is a vertical sectional view thereof.

FIG. 11 is an enlarged vertical sectional end view of a part of the upper die and the lower die.

12A, 12B, and 12C are explanatory views sequentially showing a conventional sealing operation.

FIG. 13 is a vertical cross-sectional view at the time of sealing.

[Explanation of symbols]

 1 Article 5 Film 10 Upper mold 11 Lower mold 72 Push plate 75 Second push plate

Claims (2)

[Claims] 1. In a tubular film surrounding an article fed at a constant interval along an article feed passage, an upper die and a lower die for bottom-sealing a film in a portion between the articles are provided close to each other. A bottom sealer in a packaging machine, which is provided with a push plate that presses the front side of the article in front of. 2. The bottom sealer for a packaging machine according to claim 1, wherein a second pressing plate for pressing the rear side of the succeeding article is provided behind the upper mold.